Q- describe internal structure of pinus neddle.
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Epidermis:
Leaf is covered by thick walled epidermis. Epidermis is covered by a thick layer of cuticle. Sunken stomata are present below the general surface. Two or three layered hypodermis is present underneath the epidermis. Hypodermis is composed of sclerenchymatous tissues. This hypodermis is the main strengthening tissue of the leaf.Mesophyll:
The mesophyll of the leaf is parenchymatous. It is not differentiated into palisade and spongy parenchyma. Resin canals are present below the hypodermis. Each resin canal is lined by a layer of small epithelial cells. Each leaf is supplied by two unbranched veins. Endodermis and vascular tissues:
Endodermis is present outside the pericycle. Pericycle surrounds the xylem. Pericycle is formed of parenchymatous cells. Its cells adjacent to the phloem are called aluminous cells. The cells adjacent to the xylem are called tracheidal cells. These specialized cells form the transfusion tissue. They help in the lateral flow of nutrients
Leaf is covered by thick walled epidermis. Epidermis is covered by a thick layer of cuticle. Sunken stomata are present below the general surface. Two or three layered hypodermis is present underneath the epidermis. Hypodermis is composed of sclerenchymatous tissues. This hypodermis is the main strengthening tissue of the leaf.Mesophyll:
The mesophyll of the leaf is parenchymatous. It is not differentiated into palisade and spongy parenchyma. Resin canals are present below the hypodermis. Each resin canal is lined by a layer of small epithelial cells. Each leaf is supplied by two unbranched veins. Endodermis and vascular tissues:
Endodermis is present outside the pericycle. Pericycle surrounds the xylem. Pericycle is formed of parenchymatous cells. Its cells adjacent to the phloem are called aluminous cells. The cells adjacent to the xylem are called tracheidal cells. These specialized cells form the transfusion tissue. They help in the lateral flow of nutrients
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